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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965ac99a6b098b044b02e83bdda7b565039e7e5efaea80d1ac973d912390d943' 
  AND token = 'ZVwinyhwu9hIMvxw3si3J8QynhTmpphAIwK9qpWq2Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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