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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91abb8f006b01bc85c4e785cd5fc99eb8f2299aa50a206e690c39525a4185697' 
  AND token = 'k0U4VGQGbUAEYvoJvw7HA0Gv1qI3RNzXoQz1RUCBmts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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