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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9236a4c38679c2a95b6d685ed21b31156670561ccf082400855a758a233c24e2' 
  AND token = '3c0psL1zct/A+giaPxHKOmyaCQ7LU81DzP0ICtgf9zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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