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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8235f14e13d0376e8f78ab921cb080e2e7671d2b7f5d392ad34a298e7f34ae3d' 
  AND token = '58pojXd3qR/UgP/wsb+o1aal3OBqT6hUCMmqElxFBKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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