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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b28b956af2df5885f93d73f58db15e20f77cc1a578362726e52d1e3941b0478' 
  AND token = 'asc6JHZHZy8vU7OeFTU6KT+Gb9cnEEqHXWAN+B5T7L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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