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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc83ee52656efe22594198c6a06e07b9fb8b86656b3b888e66a6214a29706f6f' 
  AND token = 'O1wRsuQ6OBMtOPqUHV3tHn8Lts/DJwnRBJWDPmu0ic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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