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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe8e44a9db25d26e2972503f28cc93982225a338228859a3f4086070b4cb5af' 
  AND token = 'EIAdwjU7r1oHLsPeBoIpos7MDBZPAdqEv0kbtGY5G/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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