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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaa56281204e7aa85a8d5ae5ca4bf67e176a987370749340d98c9d13d423be7' 
  AND token = 'QfRhb7EuvpwIbDvRztwub5XV4EojMR9BDSE8aloOJQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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