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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0122109e85118ddc154a38769ed2b104cb43456e659b3115bf799a40928f5e' 
  AND token = 'InnIxhQIw0Hg5w9xQYkYDoSkKjNbT+W5dZaLr4PLjcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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