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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b4fd3e72384011b5944cc2c172408223cf3e23534957f60496461f09baf08b' 
  AND token = 'k/dNlhGpLQsauaF6n9TgVOC6cl1gmn0eO+1EcLkvsSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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