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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14ab56c0048f9f44e46889921eade0a3ac8a3b7afaa877da0d48a63bdd7a6f6' 
  AND token = 'gtMq4/fh8byTw8ZD/iPtAYRFoUmPWitxNdccwpF4EUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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