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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d26a6002613af26b5c10eae895afe11d488f04d0feb922e5cdb77331f36ec85' 
  AND token = 'Dvr7dTHzf/MDCIeCn6b1azjz/2yp5NFF+VEzUl6tZMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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