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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1ab2cc5eb142db4e183c8a08280da02e91747ec433b086464708b96e55f02d' 
  AND token = 'NwbCccGA1LS3y9H2Bz3AGejihOEA7N9LE8Ogy1OeY4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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