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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf68d4c02bd178c21d5c0d7b1cee98ae5b0545ee60985067ce5d3d7ae3f540d7' 
  AND token = 'KKuDzukqPqrBxIlnRMBi+WHtI2EercmkexQ3ztPi8dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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