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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a645c0ed49f6c91b12a6dbad80920a3d34ca765ea4b011fcc2526654cbf70e37' 
  AND token = 'iiCbF4T1p43A8bKzHMnEVqQZdcbJ4bLjEoJEvUW8iv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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