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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d2bff85d52eec75577551b76009aecb8e5b80ed7c467545a521960300ae427' 
  AND token = '94OtIdht+dcLMxEAB0vfd8nMMrLZ7GzElqzWpS2J7kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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