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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6c8ec04fb733228a033a2290c65151776f192c4da37aa6c7afcb418f8d72ba' 
  AND token = '9rgtqfHWaWThKiI12JxKlWmSm2qblZQbf1Zh6W1PWr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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