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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2f0ef3cb32340ee7284b5cf2c0bf49b8dfe1e89197b165e8fdab65a1d161b2' 
  AND token = 'MQlBVeaUZc5htSaC8Wn704w4KwJy7K/g8p0t8C6TzIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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