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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794204e12aa3f721f00073ecadd5e4c6b4e9b6414e8661f402314c40e579ca85' 
  AND token = 'Co3ZwrunJ4GyTQ54l5GP9ILUK3BWMaqhu4pA7aHdNAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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