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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5efc4a9ef34082f3629c2918cfaec35b7fc110f5200ddd72592f9823e67bd3' 
  AND token = '5daJQC/89EkHsA4lkZS4PtioBZ+c7syhRsb5EHshizY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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