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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09af5ae6600f75e8f468a54de7214f9f5322106ff5de1e10c7c385112b49208' 
  AND token = 'aIAlWUzqG6EUPoC+gkiBR5Jyokm9h5zVlzEqr2eP+vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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