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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bad7dedd976505eab2e3cf9ee92d244614d658b4f88b95a8de1b9326295dc8' 
  AND token = '2zNzUWCxRiifRn5M1QKv7e8JGsQswwyWtRYMyLYkRmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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