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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08d0d309db34c46c6154a2954b2f7389fa7834d278d5ff80cbe4b4a02b46b36' 
  AND token = 'NgzsDpRqaR1TXhRxFLaLm/x3XaYDD7WuicoPazCFBpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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