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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89103791e5711a3565254b2f6fe18daf5ee506584cf0241f4ab0e78754af8148' 
  AND token = 'uskFQy0n01ZSWuxz31hTtnsxGpOFnyxmK4rDBFBdDr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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