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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5bef0f9fa5a8a7d66d5e621def1a9d388d73de9d7eab8bc644387e7d7849ea' 
  AND token = 'eqtP523UmwLIr9f1Kb5gJA6qbVHAORPndHk/iQof+/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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