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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a4c9b539eecf7a4d5224bacab1408e1a3ae9c7075ffdd10f461619f968d45f' 
  AND token = 'EPkpphstqzolSBD9OEj89MfmgP2jn5eX4bzDYUjXQJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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