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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2faef075c0cc78a0df27643d0c3f6f6d837015533210c558551aa34908c464' 
  AND token = 'KN32aNpSXb956Zjmeds196FrWhQl/x/BHDjKq4w2d8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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