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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafe12c4e8da5e04e3e445985a1bdf81e515244cc9004c202d77ef1332ab5948' 
  AND token = 'OaziOpTugWe/L3YYnkHV+BVi/hnuTtvX6AEF5YRPVag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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