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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34de52942f716c911f22944e750407ac15743405d4c8dd6ee28637b2356c2794' 
  AND token = '84XEteee4XC8IHniXk4KEQo9QA4KxOQK6JcoVl1Tx5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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