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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b9e24016b75cc30e9a5256138a0579ef7a9e5cee16a26b8ac198a26b76359e' 
  AND token = 'Z1v5sSTr7bc8YplXKXLD18AXqL1XTZ+YQSyz4TYhT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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