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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6025e5c6feeeae0354df17ff7550d456f23d9aa168b82bb99cab6ec36545d3e' 
  AND token = 'r3qWHnIg30iVTUjx9fPJYHyqEd4r37v61Mj1e1LDQws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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