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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30a4420553906b106dfb03efe71017a7698afa064435534f2552582de23a6a2' 
  AND token = 'BEAxU+YMYWjvZylo0EuCgU+kPJfuE4qrBVVjcucqb+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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