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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed45c2bd1609ac437c7c95111bce4ca8d54f21023f7cb9e82b144cec979f0a4' 
  AND token = 'aJGB1FLgEEPs6SiyiO80IvWGkDYii2L84JOPwTd2RLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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