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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee6d7ba3e842487f913f5f28c69a60d03d76f28d94e4c82dbebd870a426cf78' 
  AND token = 'UTsOj4e6advL5tOu4D2U4CK4/WCLbOeRG5ICy3Kyz1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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