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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de396c257eecd2906796783f4eb08636edf62fed3c399bd79835985678499931' 
  AND token = 'Pb7rOtSVNt06sBAsYL5I8++mPqi8CebqOGYKBoEgOnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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