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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4fff82b40145476013a9b8ac242f373450e0c583569b349ea845ced9e677de' 
  AND token = '2EoM+fba6OQLt9qJ9uQqe6+LPj+o4oqkQ9S2taU59LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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