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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098b984f10c8212701d363be7a05010a3307de7f1f561db71195ba3fa80ae079' 
  AND token = 'CSq1nJBvkyN4K17PsRXkX0v5ivbQ67qY/ntHmOwAsoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}