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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4855cdc46a1df1d400a55ece29b7caa4f27632a5f8ffaec360b95206fd92adb8' 
  AND token = '2LFNSa8lRy77A7MPUv7yKza20lISXT1yFg8StUM/Fac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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