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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f498e8f0549b30b7d90c8fad90ead53edbd5117af4f897f874a55c6f52d7aa' 
  AND token = 'f1CQpY7ZIinK5MoDpO57S9NbPbAK/FShipUh30dKInU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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