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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d4575915b3b7f17f766eedb347d0015c2fcce28181f5f9e2d76614b5a44b80' 
  AND token = 'IyrsHWAVG9e2qDw8GLxlkbPSCtWIij2KEBfmL8lo+XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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