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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a446f09ea997982281b14f8fda271c9e366ca351b34f1b30bd2a65bb931c644a' 
  AND token = 'oCiuRPFTas3QFd0TK5XjH/th7KM+xEWOArfMQEKkhCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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