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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b6e9a88447e7ca19e288f3b4e5968614d18c9429e0a74c4e85827370d7dc59' 
  AND token = 'sxa54yFHO09Ol53J13KtqZqxeZF3eW7FY5rqKYKRPT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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