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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa36492d22ea88401ee99e5f49c773c8a012f411a4977497a1b49dfa55ddbb67' 
  AND token = '2S+UcH8TggWkXesr0F563xPpwlLUL9uDgPPNYo6VwYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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