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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74ad1ab79b44eab3fc0697faa982cc9b4179b2e0f961c05df7a92e84dc8c48d' 
  AND token = 'zUvrUN3smw75CIklGTvn3TnNinvvCVBTwOo4mHkgeQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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