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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abacc0e44f4ae41801596855004db5a21ac6316374f36e0f5cf90589f567a94' 
  AND token = '+jkBIj6NoCXMkHEIRxvJbihavX00Dl48A0LQTyichOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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