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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b804e1720167f84b7166e1655106e14222b77b1b95b875aa5d60e54a50d0e3' 
  AND token = 'mUtjd3Hxem5NnkGzEAQL9QA3dUoJsJ0vNR6tjREJHFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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