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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f968bc04b546afaecfc0334273ce64fb40783f00b7603c16df93e7ffe18ece4e' 
  AND token = 'jzZXJuLBMWvkOI9Imozk4qVApVS1dMpZnfBjix/U4D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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