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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fda23654a9c7b8e03bab91b50266f3601e9a18337c82e762ff995e7e3a117bc' 
  AND token = 'R96cEBy35O7FWh8gCRZmihO6Q2ePzQtbT+8CrnLeBtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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