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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73345a0b7e3380d17c168ea4d9eef78412583ed65c07c7da8b37a8e09b27d594' 
  AND token = 'To5CWn+iD7uzkP0WUG5Zed6WmICO50hIbSY5GLXEgbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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