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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337dd4ef58cc7dbc1f5d6671ffc787bdedf054fbc3cc873e6740f19254cb9b7c' 
  AND token = 'TWgSz1SntjqRJI3j9iC1OX7W7VPlk2F8wFGJvu1deSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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