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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c999c6eb6a2cc298da62cd3402005cd9cb27ee0580befb46ec4350f3839a18' 
  AND token = '8XE0FYN0fP5pxVJ8asUJw6uKd0B+Ft/H8kmqmv2XmEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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