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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a701ae87b86a3ecff47cb935550e9dad2cc69df2b2ef4cd10fd59b9d0f28a3' 
  AND token = 'Z/NiColYEExEC9HAdt38q2NBu78rV8oWUocX4NwK7O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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