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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498b660078e89fca79a165c88fa1f2783c62168825cce5ef1a5296c9daadc8e5' 
  AND token = 'wiZJ5hsmLADytnrASgtJsVgesUvjf9u/0oTzTaNOfKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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