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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f590d67f21d0d15b02a39857353926c3fed7e1abbff865f84d4a2433e182be' 
  AND token = 'xE2rdcI0nns37gEY8x49J5jYntzSLOcj265GT0P+OPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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