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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdfe0af90677f6e0c84e9544e144959ed55ac49ad5640023b71cfe421740c63' 
  AND token = 'CpOOGqE2L3POMs51oiWCOc2oi7daTKvPyT3uTVvp2Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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