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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4cc4a37626d883b35522d43d88111cc95bc9a7f53aad1b8682147f363517d7' 
  AND token = 'UhzeIC5EJdYHisn3cVMaPNi7JgLOfYuALXurudWlfis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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