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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19801e1c7cfe0a1a04440d39aaf103d097fc5e69748a9ad097eea72b287c384a' 
  AND token = 'haAyxWZFG9bLuYreGsCU8P3hOGeHf+AZ7sTLcjwynPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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