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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaf7863f5a469611fffd7f176838aed26a7cda9466d787868cead4f5227f9cc' 
  AND token = 'lD2x8V8REiiTJCjmSlLEwmNpW6HRB4SDa4TV74dFJBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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