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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5444a7584d58c28bd8a4370ad0dff267c08604058135950e763df99088c8d536' 
  AND token = 'B30nKa+5U5/dsjibBvgGXP611QMydnmxE8P2gTWVQHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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