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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436f32d4c1d4ec9c10d79ed02093888cf7a87de4ae13d60604628234b6ec830e' 
  AND token = 'l4ADe6fTT60r7oPySkxbHVnB0UaCs92FoD7obeXggPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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