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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b2c217924772b96b5d716fc201807df88a7542dadd36cc9d758745f4b6ecc9' 
  AND token = 'VI1aEMeNJ41rTcspWZPtaQuoC+T8MjLuUZVD4nOeyOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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