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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad8ad53f3b666eaa5dcb51096f45374bcbeb63902e033c0e04b4c336ccfaf0f' 
  AND token = 'HaJ/I6a0AfViLI2fpJv9tORgR5r7WqEX4xod9JnlXUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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