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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9c6907da830e043ab5f82837d84c17013f46f7114dc4f68cfc0d570bfd3edf' 
  AND token = 'eqttqAyheeGIjFVwxAJV92vFHWV+sOpT2dXb3QQnwuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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