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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696b39358c160723a29ee7d7a06e7beacc57e42a945d12a80eb2dc3d27673d3e' 
  AND token = 'jk0uiKhSojb0SxKuYT7BQzAhEm6P2mqelNnfF3h08Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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