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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1567d8458ae258eb536d8a932a305339b3be2ddf070f4983ec921910ee71857' 
  AND token = 'rtnAHZKm5BKz/A5FNKJNy8piCVQiBynTmjFHYh30fbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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